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APPLICATION OF K-SULPHATE AND CHLORIDE TO EVALUATE THE ELEMENTS THAT LIMITS THE YIELD OF CUCUMBER BY USING DRIS | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 40, Issue 5, 2009, Pages 1-12 | ||
| Authors | ||
| ; | ||
| Abstract | ||
| A field experiment was conducted at fall season 2003/2004 in heated plastic house belong to Al-Moktadiya company for agriculture staffs at Al-Yousifiya district situation about 24 km south of Baghdad in a soil has a silty clay loam texture (Typic Torrifluvent), classified as MM4 (at the series level) to identify the nutrient element which limits the yield of cucumber crop (Cucumis sativus L.) cv. , Shoa’a , by using the diagnosis recommendation and integrated system. Potassium sulphate 41% K and potassium chloride 50% K were used as potassium source fertilizers. Randomized Complete Block Design was used with three replicates. Results showed according to the data obtained from this study by using the DRIS that potassium element was the limiting factor then nitrogen and phosphorus because the indices of KNP elements at flowering and harvesting were (-37.0 and -41.0) for K , (+ 1.0 and -0.3) for N and (+ 36.0 and + 44.0) for P at the flowering and maturity respectively. The level of 1000 kg K.ha-1 gave the highest yield for both K – sources that were 130.62 ton.ha-1 and 128.92 ton.ha-1 for K – sulphate and K – chloride respectively. However , there was no significant data between the two K – sources for this level, but the K – sources for this level had significant data compared with the level of 500 kg K.ha-1 for the both K – sources. Results showed also, that the level of 500 kg K.ha-1 for K – sulphate had significant data compared with the same level of K – chloride and gave the highest yield for the both K – sources that were 120.91 and 115.25 ton.ha-1 for K – sulphate and K – chloride respectively. The economical evaluation indicated and confirmed that K – chloride can used as a successful substituent for K – sulphate especially at the application of high levels of potassium fertilizers. | ||
| Keywords | ||
| Yield of cucumber; protected agriculture; drip irrigation | ||
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